A connection device for connecting charge-coupled device modules to test apparatuses to test the CCD modules includes a connection unit and a test unit. The solar receiver also has a plurality of light-reflecting elements arranged on the external surface. The surface electrode has higher adhesion for the drift layer 6 andor stability for the lapse of time. The three concrete panels and the three generally hexagonal columns may jointly form a generally equilateral triangular prism. The second lens includes lower and higher optical powers equal to the second base refractive power plus the second lower and higher diffractive powers, respectively.